| 摘要 |
A device for ascertaining knock as well as the max. pressure-angle in an IC engine and, in partic. for controlling the ignition time point, includes a pressure sensor (21) adjacent to combustion chamber, a crank-angle sensor (32), a signal generator circuit (20) connected to the pressure sensor (12), and an evaluating device (30) connected to the signal generation circuit (20) and to the crank-angle sensor 932) in order to determine the max. pressure angle at which the cylinder pressure is maximal, at which point the generator circuit (20) provides a first signal pulse when the output signal from the pressure sensor (12) attains a first max. value. A filter device (16) is connected into the circuit in order to simultaneously ascertain knock and the max. pressure-angle between the pressure sensor (12) and the signal generator circuit (20) and its output signal is compared, via a comparison element, with a reference value in order to provide a signal pulse when the proportion between the output signal (or the difference signal) and the reference value turns or reverses in a given direction. The evaluation device counts the number of signal pulses and decides that knock has occurred, when the number counted exceeds a given figure.
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